Equipment for Volume Studies.—The volume of the specimens may be determined by means of several methods of which one or the other may be the more convenient. The direct determination of volume is made most conveniently by means of a voluminometer of the Seger type, illustrated in Fig. 4. The apparatus is first filled with kerosene to the zero mark of the burette which coincides with the zero mark of the tube, attached to the cap of the bottle.
me not less than 800 o.c»
Q- Ground Glass Joint -Schurecht voluminometer.
Sufficient of the liquid to allow for the introduction of the specimen is then drawn up into the burette and bulb on top of the latter and the stop cock placed in the shutoff position. The cap is removed, the specimen previously saturated with petroleum placed in the bottle, the cap replaced and the liquid allowed to run back into the bottle up to the zero mark. The stop cock is closed again and the volume of the test piece read from the burette which is graduated to 0.1 c.c.
Indirectly, volume may be determined by two weighing methods. One method consists in saturating the specimen by immersion in a suitable liquid, kerosene or water, and weighing it in this state. The same test piece is then weighed while suspended in the liquid. From these weights the exterior volume of the specimen, in cubic centimeters, is computed from the relation: v = (w — s)/5, where v = exterior